I think this will also fix the problem of the translator increasing the language level:
Previously, the composer translation agent prompt instructed the model to act as an “improver” and replace the author’s words with “more beautiful and elegant, upper level” language, which caused heavy rewrites and odd word choices in some languages.
This change rewrites the prompt to produce a faithful translation that preserves the original meaning, tone, and formality level, only fixing small grammar, spelling, and punctuation mistakes, and preserving markup as-is.